Combined handle and ejector



Dec. 25, 1962 R. E. man-:RICH

COMBINED HANDLE AND EJECTOR 5 Sheets-Sheet l Filed Feb. 15. 1961 Dec. 25, 1962 R. E. DIETERICH 3,070,382

COMBINED HANDLEAND EJECTOR Filed Feb. 13, 1961 v v SSheets-Sheet 2 $.32 )INI fly- 5 Dec. 25, 1962 R. E. DIETERICH COMBINED HANDLE AND EJECTDR Filed Feb. 15, 1961 3,@7082 Patented Dec. 25, 1952 u il 35,07% ,332 (IQMBHNED HANDLE AND HEESTOR Richard E. Dieterich, Long Beach, lind., assigner to Phiilips Drill Company, Michigan City, had. Filed Feb. 13, i965., Ser. No. 8&'759 .16 Claims. (Cl. 279-103) This invention relates generally to apparatus for installing self-drilling concrete fasteners and more particularly, is concerned with an improved combined handle and ejector apparatus for use with a percussive hammer to drive such shells into concrete, masonry or the like.

The concrete fasteners or shells, as they are sometimes known, intended to be installed through the use of the invention herein are generally disclosed in U.S. Patent No. 1,996,121. A shell of this construction comprises an elongate cylindrical steel member with a hollow center that is internally screw-threaded to receive a bolt or the like. At the end of the member which is inserted into the concrete or masonry there are provided hardened cutting teeth, annular broaching grooves and axially extending elongate grooves. At its opposite end there is provided a relatively short, conically tapered portion separated yfrom the remainder of the shell by an annular fracture groove. The tapered end of the shell is inserted into the tool holder or chuck, as it is konwn, and the chuck is mounted on a percussive hammer. A handle is secured to the chuck so that as the blows are being struck by the hammer, the handle can be swung back and forth in order to facilitate the cutting of a smooth hole. The mounting of the chuck to the percussive hammer is such as to permit such swinging thereof. The cuttings nd ytheir way up through the shell into the hollow bore of the chuck and out through suitable passageways usually formed transversely of the chuck.

After the shell has been drilled to the desired depth, it is removed from the hole, the hole is blown out so that it is clean, a short tapered plug is inserted in the toothed end of the shell, the shell with plug then is inserted into the hole and driven home by blows of the percussive hammer made without rotating the chuck and shell. As this occurs, the toothed end of the shell splits along the axial grooves spreading said toothed end in the bottom of the hole and securely and permanently holding the shell in piace. Thereafter, with a sharp lateral blow, the tapered end of the shell is broken off at the fractured groove and this short piece remains in the chuck. The usual chuck construction provides the relief passageway for egress of the cuttings so to intersect the tapered socket which receives the shell end so that a small portion of the shell end protrudes into the passageway. When it is desired to eject the severed shell end from the chuck, the user inserts into the passageway a rod of substantially the same diameter as the passageway but with a attened end. The ilattened end is engaged against the shell end and the rod, or key as oftentimes it is called, is rotated bringing the rounded portion of the rod into engagement with the shell end and thereby camming the end of the shell out of the chuck.

As will be seen, the above described procedure which has heretofore been necessary because of the construction of the apparatus used to install the shell, includes the step of manipulating an ejector key in order to rid the chuck of the broken of shell end for each shell installed.

In the US. Patent No. 2,801,614- there is described a combined handle and key in which the handle itself includes a portion extending through a transverse passageway of the chuck which in turn is intersected by the socket receiving the conical shell end. A portion of the shell end, therefore, protrudes into the passageway. The part of the handle which is engaged in the passageway has a flattened portion which normally faces the shell end and clears the same during the time that the workman is rocking the chuck back and `forth during installation of the shell. After the shell has been inserted and the tapered end broken off, the handle is rotated bringing the rounded portion into engagement with the shell end and ejecting the same.

It will be seen that the construction of the above Patent No. 2,801,614 eliminated the need for an additional to-ol to be carried by the workman, namely, the ejector key.

The invention herein inter alia comprises an improvernent upon the combined handle and ejector above described. 1

The principal object of the invention is to provide the improved combined handle and ejector apparatus in which the relief passageway for cuttings passing up through the shell and into the chuck and out of the chuck will be substantially unobstructed.

Still a further object of the invention is to provide a combined handle and ejector apparatus for use with concrete fastener installing devices in which the handle is provided `with removable tips that engage in a transverse passageway of the chuck and which tips are readily assembled to or disassembled from the handle and hence are easily replaced.

A still further object of the invention is to provide.

apparatus of the character described which is of simple structure and economical manufacture yet being highly effective lfor the purposes for which intended.

Other objects tlow from the invention as a direct result thereof, such as the provision of a combined handle and ejector which is readily disassociated from the chuck by simple manipulation; which will enable a chuck to be made of simpler construction and smaller size than heretofore was possible; and the increase in speed and economy of installation of shells resulting for use of said improved structure.

With the foregoing and other objects which will become more apparent as the description of the invention procceds, there have been illustrated and described hereinafter the details of several preferred embodiments of the invention in order best to illustrate the manner in which the same is carried out. Several forms of the invention emphasize further that many modications are feasible without departing from the principles of the invention.

Like reference characters are used in the several figures `of the drawings wherever feasible to designate the same or equivalent parts.

In the said drawings:

FIG. l is a perspective view showing generally a percussive hammer with a chuck being used to install a concrete fastener and having a combined handle and ejector apparatus embodying the invention associated with the chuck.

FIG. 2 is an enlarged fragmentary side elevational view of the apparatus shown in FIG. 1 with portions in section to show certain details thereof.

FIG. 3 is an elevational view with portions shown in section to illustrate the manner in which a shell end is ejected by rotating the handle, the view being taken from the left side of FIG. 2 looking toward the chuck.

FIG. 4 is a median sectional view on an enlarged scale showing the construction of the combined handle and ejector apparatus of FiGS. 1, 2 and 3.

FIG. 5 is a sectional view taken generally along the line 5 5 of FIG. 4 and in the direction indicated with portions shown in elevation, and illustrating also a modied form of the invention.

FIG. 6 is a fragmentary sectional view similar to that of FIG. 4 but illustrating the manner in which the handle is rotated in order to cam the severed tapered end of the concrete fastener or shell out of the chuck socket.

FIG. 7 is a perspective view of a handle tip showing the construction of the camming extension.

FIG. 8 is a fragmentary bottom plan view of a chuck and the ends of a handle of modified construction, the broken lines illustrating the manner in which the handle is disassociated from the chuck.

FIG. 9 is a View similar to that of FiG. 8 but illustrating a further modified form of the invention, one of the tips of the particular handle being illustrated in exploded relationship, and the view including an illustration of the manner in which the handle may be manipulated readily to disassociate the saine from the chuck.

FIG. l is a perspective View of the combined handle and ejector apparatus of the construction of the invention shown associated with a chuck the construction of which is substantially different rom those illustrated previously.

FIG. l l is a median sectional view with portions shown in elevation of a chuck of unusual construction made postsible through the use of the invention.

FIG. l2 is a top plan view of a one piece handle without tips of construction suitable for use with any of the tips illustrated.

As may be deduced from the statements of the objects hereinabove, the primary attributes of the invention relate to a construction which enables the passageway for cuttings through the chuck to be substantially unobstructed and a construction in which the camming means provided for ejecting the shell ends from the chucks is formed on tips readily removable from the body of the handle. Such removability enables the tips to be formed of more durable steel; enables the tips to be formed independently of the body of the handle; enables the tips to be readily replaced when worn or damaged.

The invention is exemplified in a handle formed by a forked or bifurcated member having a caminng extension at each forked end extending into a transverse passageway in thc chuck. The socket formed in the end of the chuck is arranged so that when a shell is seated in the socket, the end of the shell will intersect the transverse passageway. The camming tips have flattened portions facing the end of the shell when the handle is in position to enable the same to be manipulated by the user in swinging the chuck back and forth during the drilling of the hole. When the user rotates or swings the handle partially around the axis of the transverse passageway, the rounded portion of the cumming extension is brought into engagement with the shell end and ejects the same. Various modifications will be described hereinafter.

In FIG. 1 there is illustrated what may be generally designated a percussive hammer Ztl which delivers repeated axial blows to a chuck designated generally 22 secured in the operating end of the percussive hammer 20. The Workman holds the percussive hammer Ztl with one hand as shown at 24- so that the concrete fastener or shell 26 is engaged against the surface into which it is desired to install the same. With his other hand 28, the workman grasps the handle designated generally 3l) that is connected to the chuck 22. As the hammer 2t? is delivering its percussive blows, the workman swings his arm 23 back and forth around the axis of the chuck, that is, the vertical axis as viewed in FIG. l, to enable the hole being drilled by the shell of fastener to be round and clean. As the hole is being drilled, the cuttings or debris which are produced will pass through the hollow bore of the shell and out through a relief opening normally provided in the chuck 22. ln the particular embodiment shown additional means designated generally 32 are used to draw the cuttings out from the center of the chuck Looking now at the particular details illustrated in the other views, the invention primarily is concerned with the construction of the handle 3@ having the socalled tips 34 which are secured on the respective ends of the handle in a manner which will be discussed. The invention also l concerns the combination of such handle with a chuck. 'Ihe construction of the various other apparatus will provide a better understanding of the invention if detailed at this point.

In FlGS. l, 2, 3, 4 and 6, it is intended that the cuttings which are being made while the apparatus is being used will be drawn out of the chuck 22 by means of a source of vacuum, such as provided by a vacuum cleaner, or the like. rl`he chuck, therefore, has a cylindrical body portion 36 that has a hollow central bore 3d (FIG. 4) that connects with a lateral upwardly slanted conduit 4S welded or otherwise secured to the body 36. A flexible hose, such as designated 32, is mounted to the free end 42 of the conduit d6, and the path of the cuttings is shown by the arrows in HG. 4. At its upper end, the chuck 22 is provided with a tapered socket i4 intersected adjacent the bottom thereof by a transverse cylindrical passageway x6 formed in the chuck body 36.

In the particular' construction shown, an adapter 43 provides a connection between the percussive hammer 20 and a chuck 22. The adapter ttl has a shank 50 which may be of any desired configuration to fit any desired make and model of percussive hammer. The bottom end of the adapter 48 is provided with a conically tapered end formation S2 which engages in the socket 44, being limited in its inward movement by a flange 54 integral with the adapter The key and groove arrangement shown at 56 permits rotation of the adapter t3 while the handle 30 is being swung back and forth. Member 53 is a protective rubber dust cap. The transverse passageway 46 is for the purpose of separating the adapter 158 from the chuck 22 and the said passageway 46 can receive therein a rod or key having a flattened side which may be rotated to force ejection of the tapered end S2.

The above described two piece chuck and adapter construction is set forth in more detail in U.S. Patent No. 2,918,290 which is owned by the assignee of this application. The invention is readily capable of being used with the conventional construction of chuck in which the shank 5ft and the chuck 22 are formed as a single integral member.

The bottom end of the bore 3S opens to a tapered axial socket 6) which is constructed to receive the tapered end 62 of the shell 26 in mating engagement therewith. A transverse passageway 64 is intersected by the tapered socket 6 so that when the tapered end 62 of the shell 26 is engaged in socket 6d, the upper end face 66 of the said `tapered end 62 will protrude into said passageway 64.

As previously mentioned, the handle 3G is associated with the chuck 2-2 in such a manner that the handle Eil may be used to swing the chuck 22 about its axis, and the handle itself may be rotated about an axis transverse of the chuck 22. rThe latter axis is also the axis of the transverse passageway 64.

The handle 30 preferably is formed of a single wire member the plan configuration of which is shown in FIG. l2 and the side elevational configuration of which is shown in FIG. 2. The handle 3u has a bight or loop 67 which is adapted to be grasped by the workman and a forked or bifurcatcd end providing the arms 63 which are threaded at their extremities 70. The arms 68 and the bight 67 are connected by an oblique portion 72 which enables facile manipulation of the apparatus. Each of the extremities 72 has a tip 34 engaged thereon.

The tips are identical except that in certain instances they will be formed as right and left members and hence a description of one will suffice. The best View for an explanation of the structure of the tip 34 is FIG. 7. There is a body portion 74 which is threaded at 76 to provide a socket for the reception of the extremity 70 of one of the arms 5S. The body portion 74 has a smaller cylindrical extension 73 the axis of which is normal to the axis of the threaded socket 76 and the extension 7S is provided with a flattened `surface Si) Which is preferably ground or otherwise formed by removing metal from a segment of the cylindrical extension 78. It is desired that the portion of the extension '78 remaining be as sturdy as possible andhence only sufficient material is removed in forming the surface 8G to assure ejection of the shell end 62 in a manner which will be described.

In FIG. 7, the end face 822 of the extension 78 is planar but in the structure shown in FIG. 5, the ends 82 are shown to be concave or arcuate, in order to provide a better passage for the debris.

Referring now to FIG. 5, it will be seen that each of the tips 34 is engaged upon the threaded 'extremity 70 of its respective arm 68 in such a manner that the cylindrical extensions 7S are coaxially aligne-d. ln this condition the said coaxial extensions 78 are engaged in the opposite ends of the transverse passageway 64 so that the flat surfaces 89 face downwardly, that is, face toward the entrance way of the tapered socket 60. While so disposed, the tips 34 cannot rotate relative to the respective arms 63, and hence there is no need for the tips 34 t-o be tightly engaged upon the said respective arms. In this disposition, the handle 3) extends substantially horizontally, that is, at a right angle relative to the axis o-f the chuck 22, as best shown in FIGS. 2 and 4. Also in FIG. 5 it will be noted that there is a minimum of obstruction in the bore 3S for the passage of cuttings. As previously mentioned, the shell 26 is hollow and hence it has a central bore 83 by way of which the cuttings rise or are drawn up into the central bore 33. The body portion ofthe shell 26 is threaded as indicated at 254.

During the installation of the shell or concrete fastener 2.6, the iirst phase consists of causing the shell to drill its own hole in the manner illustrated in FIG. 1. The rst phase of installation includes the rocking or swinging of the handle 36 back and forth in a horizontal plane, as viewed in FIGS. 1, 2 and 4, at which time the disposition of camming extensions 7S and the flat surfaces 80 are as shown. It will be seen that there is clearance between the free end 66 of the tapered portion 62 of the shell 26 and the said flat surfaces Si). After the hole has been drilled and the plug inserted into the toothed end and the shell has been set permanently in the masonry or concrete 86 as shown in FIG. 2, the tapered end 62 is broken off by a sharp lateral strain applied by bending the entire assembly of hammer 2t) and chuck 22. The fracture occurs at the groove 83 so that the chuck 22 is now left with a short broken off end 62 tightly engaged in the tapered socket 6d. The workman now rotates the handle 3d in a direction indicated by the arcuate arrow L in FIG. 4. rlhis rotation causes the camming extensions 78 to rotate a few degrees, usually about 45 being sulicient depending upon the segment cut out in forming the flat surfaces 80. As shown in FIG. 6, this brings the camming edge Si against the end 66 and exerts a substantial force therein to dislodge the same as a result of which the same falls out of the tapered socket 6l). The handle 3d is then returned to its horizontal position and the next shell is inserted.

The construction which has been described has the advantage that the tips 34 are readily removable from the arms 68 of the handle Elli. Since these tips will be subjected to the abrasion of passing debris as well as to forces exerted in camming the shell ends out of the chuck, they may be forged or otherwise fabricated of tough steel, for example, and/or hardened. The handle 36 economically is fabricated from cold rolled steel and need not be hardened. Obviously, in associating the handle 30 with the chuck or disassociating the same from the chuck it will be necessary to spread the bifurcations or arms 68 to withdraw the cam extensions 78 from the transverse passageway 64 of the chuck. This process however is simplified by reason of the ready removability of the tips and the fact that they may be engaged loosely on the threaded extremities 70.

In FIG. 9, the reference character 22 designates any chuck construction having the transverse passageway 64 adapted to receive the cam extension 78 of the respective tips 34. The upper illustrated one of the tips is shown removed from the passageway 64 and unscrewed from the extremity '76. Considering however the situation in which the tip 34 will still remain in position on the extremity 7), it will be readily observed that if the upper arm 68 is pulled away from the chuck 22 'just a sufiicient amount until the cam extension 73 clears the opening, it may be rotated about the lower arm 68 since the threaded connection between the extremity 7d and the tip 34 of the lower arm is loose, thereby bringing the upper arm 63 and its tip to a position such as illustrated in broken lines. Obviously, a lateral movement of the handle 38 will withdraw the other tip 34 from the opposite end of the passageway 64. This provides a very convenient and very simple manner of removing the handle from the chuck 22.

FIG. 9 also illustrates another feature of the invention in which the body 74 of the tips 34 has the threaded opening 76 extending completely through the same. It will be noted that in the tips previously described the opening 76 forms a closed-end socket.

Continuing with the description of the particular tips shown in FIG. 9', since the tips are readily screwed onto the extremities 7@ from opposite ends of the threaded passageway or opening 76, these tips 34 of FiG. 9 are readily reversible and hence need not be made right and left. One configuration of tip will t either of the extremities lil and be engageable into the passageway 64 to presentits flat surface 8@ in the proper direction.

FIG. 8 illustrates a simple construction for the combined handle and ejector key in which the handle has the extremities 70' of its arms 63 bent inwardly. The extremities '7d' are provided on the ends thereof with the same general configuration as the camming extensions 78, thereby providing the Hat surfaces 80' and the camming edges Sil to be used in ejecting shells. In this case, the handle and the extremities 70 are all formed integrally and the extremities 70 may be hardened after formation. This provides a more economical structure although the advantages of tip replacement and the previously described manner of disassembly and assembly are not available. For example, in removing this handle from the chuck 2, it is necessary to spread the handle an amount sufficient to clear the chuck on both sides as shown by the broken line portions of the view.

`In FIG. l() there is illustrated a simple chuck 22 i which there is a central bore 3S which connects with a tapered socket 6l? intended to receive a shell therein. [Instead of operating into a vacuum apparatus, the debris is intended to move up the bore 38 and out through a second transverse passageway 9d which is formed in the chuck 22. This passageway 9@ is the same in function as the passageway 46 of FIG. 4 with the exception that instead of the body 36 of the chuck 22 being solid, there is an extension of the central bore 3@ which connects with the transverse passageway M so that the debris will be ejected as the device is being used. The handle 36 of FIG. l-D may be of any of the constructions described, and the chuck 22 may be mounted to the percussive hammer 26 either by virtue of an adapter 48 or by virtue of an integral extension of the chuck 22. In other respects the arrangement is similar to those described.

As previously mentioned, it is possible by virtue of the construction described to make the chuck 22 very small. In FIG. l1, for example, there is illustrated a chuck 22 in which the body 36 has the transverse passageway 64 which is adapted to seat the cam extensions 78 of the tips 34 of the handle 36. The tapered socket 6i) is provided in the bottom of the chuck and there is another transverse passageway designated 92 formed at the body 36 crosswise of and intersecting the passageway 6d. The

act/'ossa cuttings and debris, therefore, will come through the bore d3 of the shell and immediately pass out of the transverse passageway 92. Since these transverse passageways 64 and 92 are at the same level, the length of the chuck 22 is substantially decreased.

Any simple means of securing the chuck to the percussive hammer 2d can be used. For example, in the structure of FIG. ll there is a shank or adapter d3 which is not provided with a tapered end but seats in a cylindrical socket 94 formed in the upper end of chuck 22. Slots 96 are cut in the chuck on opposite side thereof to enable a horseshoe shaped collar or ring 9S to be accommodated. The adapter will have a groove cut in its end so that the ring 9?; may be snapped into the groove to hold the shank or adapter di', in place.

Instead of extending horizontally in the manner shown in HG. 2 for example, the handle 30 may be shorter and formed with a right angle bend adjacent the extremities 7G so that the handle extends parallel with the axis of the chuck. Such a construction is for use where the percussive hammer itself provides the necessary oscillating movement of the chuck during the driving of the shell. ln such case the handle is only for the purpose of being grasped and pulled downwardly in order to eject a broken off shell end. A suitable spring clip on the chuck easily may be provided to keep the handle in its vertical position while the shell is being inserted.

From the above description it will be seen that the invention is capable of considerable 'variation without departing from the spirit or scope of the invention as defined in the appended claims intended to be liberally construed.

What it is desired to secure by Letters iatent in the United States is:

l. A combined handle and ejector adapted to be associated with a chuck used in installing a self-drilling shell having a tapered end and in which the chuck has a tapered socket at one end thereof adapted to receive the tapered end of the shell and a transverse passageway intersecting the tapered socket so as to enable the shell end to protrude into the transverse passageway when same is installed in the tapered socket, and a second passageway to provide egress for cuttings as they pass through the shell during installation thereof, said combined handle and ejector comprising a bifurcated member providing a pair of extremities adapted to straddle the chuck, means provided on the said extremities adapted to be engaged in the opposite ends of the transverse passageway but spaced apart within the tapered socket to permit debris to freely pass to the said second passageway, camming surfaces on the said spaced means normally clearing the end of a shell inserted in said tapered socket, but engageable with the end of said shell by rotation of said handle about the axis of said transverse passageway whereby to elect the said shell end.

2. rl`he combined handle and ejector as described in claim l and in which said spaced apart means are removably secured on said extremities.

3. The combined handle and ejector as described in claim l in which said bifurcated member is formed of a single length of wire, said extremities are threaded and said means comprise tip members screwed on said extremities.

4. The combined handle and ejector as described in claim l in which said means comprise at least one tip member having a body portion, said body portion having a socket for removable mating engagement of an extremity therein, said body portion having a reduced dimension extension transverse to the axis of said socket, said camming surface being provided on said extension.

5. The combined handle and ejector as described in claim 1 and in which said means comprise reduced dimension substantially cylindrical extensions on said extremities each having a flattened surface intersecting a rounded portion of said extension to provide said camming surface.

6. The combined handle and ejector as described in 8 claim 5 and in which said means are removably'securcd on said extensions.

7. ln combination, a chuck for a percussive hammer and adapted to mount a self-drilling expansion shell, said chuck comprising a substantially cylindrical body having a coaxial socket at one end thereof adapted to receive said shell frictionally engaged therein, a first transverse passageway having its axis substantially perpendicular to the axis of said socket and intersecting said socket so that said shell end when engaged protrudes into the passageway, a relief passageway communicating with said socket for discharging debris entering said chuck body through the shell, and a combined handle and ejector apparatus mounted on the chuck body for rotating the chuck and ejecting the shell end, said apparatus comprising a forked member having a pair of extremities on opposite sides of the chuck body and camming means on each extremity movably engaged in the transverse passageway, said camming means being spaced apart on the interior of said transverse passageway to permit discharge of debris through said relief passageway and aligned with said smell end for selectively ejecting said shell end from the socket upon rotation of the handle.

8. In combination, a chuck for a percussive hammer and adapted to mount a self-drilling expansion shell, said chuck comprising a substantially cylindrical body having a coaxial tapered socket at one end thereof adapted to receive said shell frictionally engaged therein, a first transverse passageway having its axis substantially perpendicular to the axis of said socket and intersecting said socket so that said shell end when engaged protrudes into the passageway, a relief passageway communicating with said socket for discharging debris entering said chuck body through the shell, and a combined handle and ejec- -tor apparatus mounted on the chuck body for rotating the chuck and ejecting the shell end, said apparatus comprising, a forked member having a pair of extremities on oppositesides of the chuck body and camming means on each extremity movably engaged in the transverse passageway, said camming means being spaced apart on the interior of said tapered socket to permit discharge of debris through said relief passageway and aligned with said shell end for selectively ejecting said shell end from the socket upon rotation of the handle, said cumming means comprising tip members removably secured on said extremities and extending inwardly into the opposite ends of said transverse passageway.

9. In combination, a chuck for a percussive hammer and adapted to mount a self-drilling expansion shell, said chuck comprising a substantially cylindrical body having a coaxial tapered socket at one end thereof adapted to receive said shell frictionally engaged therein, a first transverse passageway having its axis substantially perpendicular to the axis of said socket and intersecting said socket so that said shell end when engaged protrudes into the passageway, a relief passageway communicating with said socket for discharging debris entering said chuck body through the shell, and a combined handle and ejector apparatus mounted on the chuck body for rotating the chuck and ejecting the shell end, said apparatus comprising, a forked member having a pair of extremities on opposite sides of the chuck body and camming means on each extremity movably engaged in the transverse passageway, said camming means being spaced apart on the interior of said tapered socket to permit discharge of debris through said relief passageway and aligned with said shell end for selectively ejecting said shell end from the socket upon rotation of the handle, said camming means comprising said extremities having reduced dimension extensions rotatively ,iournalled in opposite ends of said transverse passageway, each extension having a attened surface and a rounded surface intersecting said flattened surface to rovide said camming means.

10. In combination, a chuck for a percussive hammer and adapted to mount a self-drilling expansion shell, said chuck comprising a substantially cylindrical body having a coaxial ytapered socket at one end thereof adapted to receive said shell frictionally engaged therein, -a irst transverse passageway having its axis substantially perpendicular to the axis of said socket and intersecting said socket so that said shell end `when engaged protru-des into the passageway, a relief passageway communicating wi-th said socket for discharging deb-ris entering said chuck body lthrough the shell, and la combined handle and ejector apparatus mounted on Ithe chuck body for rotating the chuck and ejecting the shell end, said apparatus comprising, a forked member having a pair of extremities on opposite sides of the chuck body and camming means on each extremity movably engaged in the transverse passageway, and extending into the socket, said camming means being spaced apart on the interior of said tapered socket to permit discharge of debris through. said relief passageway and aligned with said shell end for selectively ejecting said shell end from the socket upon rotation of the handle, said camming means comprising tip members removably secured on said extremities and rotatively joumalled in opposite ends of said transverse passageway.

l1. The combination as `described in claim l in which each tip member includes a cylindrical body portion and a substantially cylindrical extension protruding from an end face of said body portion, said extension having a attened `surface and a rounded surface intersecting one with the other to provide said camming means.

12. The combination as described in claim 9 in which said relief passageway is substantially normal to the transverse passageway with lthe axes of said passageways being substantially copianar.

13. The combination as described in claim 12 in which said chuck body h-as a second coaxial socket at its opposite end for mounting the chuck on the percussive hammer, said chuck body having la groove in the circumferential wall thereof spaced from said opposite end and intersecting said second socket.

14. In combination, a chuck for a percussive hammer and adapted to mount a self-drilling expansion shell, said chuck comprising a substantially cylindrical body having a coaxial socket at one end thereof adapted to receive said shell frictionally engaged therein, a first transverse passageway having its axis substantially perpendicular to the axis of said socket and intersecting said socket so that said shell end when engaged protrudes into the passageway, a relief passageway communicating with said socket for discharging debris entering said chuck body through the shell, and a combined handle and ejector apparatus mounted on the chuck body for rotating the chuck and ejecting the shell end, said apparatus comprising, a forked member having a pair of extremities on opposite sides of the chuck body and camming means on each extremity movably engaged in the transverse passageway, said camming means being spaced apart on the interior of said transverse passageway partially within the socket to permit discharge of debris through said relief passageway and aligned with said shell end for selectively ejecting said shell end from the socket Aupon rotation of the handle, said handle being formed of a single length of wire.

15. In a chuck assembly for installing self-drilling shells in concrete or masonry, the shell having a tapered end and the chuck having a tapered socket at one end thereof adapted to receive said tapered shell end and a transverse passageway intersecting the tapered socket so as to enable the tapered shell end to protrude into the transverse passageway and a relief passageway for discharging cuttings passing through the shell during installation thereof, a combined handle and ejector adapted to be associated with the chuck for selectively rotating said chuck about the longitudinal axis thereof during said installation and for ejecting said shell end from the socket comprising, a bifurcated member having a handle end and its opposite end adapted to be rotatively journalled straddling the chuck, camming means on said opposite end engaged in said transverse passageway normally clearing the tapered end of the shell, but engageable with said tapered end by rotation of the handle about the axis of said transverse passageway whereby to eject the said shell end, said camming means disposed partially within said socket to permit said cuttings to pass from the shell into the relief passageway during installation of the shell, said camming means comprising at least one tip member removably secured on said opposite end of the handle and adapted to engage in an end of said transverse passageway.

16. In a chuck assembly for installing self-drilling shells in concrete or masonry, the shell having a tapered end and the chuck having a tapered socket at one end thereof adapted to receive said tapered shell end and a transverse passageway intersecting the tapered socket so as to enable the tapered shell end to protrude into the transverse pas sageway and a relief passageway for discharging cuttings passing through the shell during installation thereof, a combined handle and ejector adapted to be associated with the chuck for selectively rotating said chuck about the longitudinal axis thereof during said installation and for ejecting said she-l1 end from the socket comprising, a bifurcated member having a handle end and its opposite end adapted to be rotatively journalled straddling the chuck, camming means on said opposite end engaged in said transverse passageway normally clearing the tapered end of the shell, but engageable with said tapered end by rotation of the handle about the axis of said transverse passageway whereby to eject the said shell end, said camming means disposed partially within said socket to permit said cuttings to pass from the shell into the relief passageway during installation of the shell, said camming means comprising at least one extension on said opposite end of the handle substantially cylindrical having a reduced dimension portion extending into the transverse passageway from the end face of said extension to provide said camming means.

References Cited in the file of this patent UNITED STATES PATENTS 2,399,939 Phillips May 7, 1946 2,767,988 Dieterich Oct. 23, 1956 2,801,614 Dieterich Aug. 6, 1957 2,926,353 Werstein Mar. 1, 1960 2,930,627 Dieterich Mar. 29, 1960 2,936,736 Werstein May 17, 1960 

